Sync problem with shopify

Deal all
I have connected ERPNext to Shopify via private app; 3 types of data should sync in between Customers, Items and Orders. For me Customers and Items are OK. only Orders does not sync between shopify and erpnext
ERPNext version is 10.1.5 and Shopify version is 10.0.25
please let me know if is there that I’m missing